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 Post subject: Schmidt trigger
PostPosted: Tue May 26, 2009 5:55 am 
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Joined: Mon Feb 25, 2008 8:40 pm
Posts: 157
Location: Peterborough UK
Is there such a device in the SDK?

I am anxiously waiting for the postman to bring me the SDK paperwork from Ralf...
in the meantime -
I want to take the beat frequency between 2 oscillators (at low frequency), feed through a Schmidt trigger to trigger an envelope. Can it be done or is the Schmidt trigger redundant?

Eric.

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 Post subject: Re: Schmidt trigger
PostPosted: Tue May 26, 2009 6:13 am 
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Joined: Sun Apr 29, 2001 4:00 pm
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Location: Great white north eh
all that is is a gate which is triggered at a higher level than it releases, (it has hysteresis)
are you trying to have the beat frequency actually turn the envelope on and off? why would you do that :D


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 Post subject: Re: Schmidt trigger
PostPosted: Tue May 26, 2009 6:35 am 
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Neutron wrote:
all that is is a gate which is triggered at a higher level than it releases, (it has hysteresis)
are you trying to have the beat frequency actually turn the envelope on and off? why would you do that :D


Yes I want to turn the envelope on and off with the resulting square wave produced by the Schmidt trigger. The beat from the 2 oscs would pass through a low-pass filter then be squared up by the Schmidt. Does an envelope generator require fast leading/trailing edges or could you feed it the waveform from the low-pass filter and let it trigger when the level is high/low enough? (In an electronic circuit, this wouldn't be repeatable or predictable enough.) In emulation maybe you can't connect an audio source to a trigger destination.

As for why - why not? :D

Eric.

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 Post subject: Re: Schmidt trigger
PostPosted: Tue May 26, 2009 6:40 am 
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Location: Great white north eh
you have to change the resulting signal to a "gate" i believe it would work without anything else, that stuff usually works on zero crossing.

or you can just use an envelope follower set to very fast attack and decay, on a low enough frequency it will just turn on and off and you can adjust the threshold.


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 Post subject: Re: Schmidt trigger
PostPosted: Tue May 26, 2009 5:29 pm 
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Location: Peterborough UK
Thanks.

I guess it will all become clear when SDK arrives. :)

Eric.

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